Lock bolt

ABSTRACT

A lock bolt is provided having an L-shaped strike plate and an L-shaped bolt housing. When the strike plate and bolt housing are connected to the respective door and door jamb, one arm of each of the L&#39;&#39;s will be facing and adjacent to the other. A sliding bolt is provided with knob means for enabling an operator to slide the bolt manually. The bolt housing has a locking recess cooperating with the knob means for retaining the knob means in a fixed, closed position when the bolt has been slid to its closed position.

[ May 7, 1974 LOCK BOLT 593,890 9/1925 France 292/337 [76] Inventor: Kenneth C. Westcott, 3253 N.

Cllfton Chlcago 60657 Primary Examiner-Albert G. Craig, Jr. [22] Filed; Apr, 5, 1972 Attorney, Agent, or FirmGeorge H. Gerstman Appl. No.: 241,233

[52] U.S. Cl 292/33, 292/150, 292/157, 292/337, 292/340 51 Int. Cl. EOSc 1/06, EOSb 9/00 58] Field of Search 292/33, 42. 138, 150, 157, 292/162, 337, 340

[56] References Cited UNITED STATES PATENTS 1,428,367 9/1922 Forlander 70/104 1,479,371 1/1924 Moskowitz et al 292/340 3,325,201 6/1967 Pennings et a1 292/169.17 FOREIGN PATENTS OR APPLICATIONS 2357 1907 Great Britain 292/150 [57] ABSTRACT A lock bolt is provided having an L-shaped strike plate and an L-shaped bolt housing. When the strike plate and bolt housing are connected to the respective door and door jamb, one arm of each of the Us will be facing and adjacent to the other. A sliding bolt is provided with knob means for enabling an operator to slide the bolt manually. The bolt housing has a locking recess cooperating with the knob means for retaining the knob means in a fixed, closed position when the bolt has been slid to its closed position.

3 Claims, 3 Drawing Figures LOCK BOLT This invention relates to an improved lock bolt for use on doors and adjacent door jambs.

There are numerous types of lock bolts in use today, for particular use in residences and apartments. Typically, the lock bolt has a strike plate which is connected to a door jamb and a bolt-carrying member which is connected to a door. When the door is closed, the bolt can be slid into receiving means carried by the strike plate. Many prior art lock bolts can be disengaged by inserting a tool from the outside of the premises.

It is, therefore, an object of the present invention to provide a lock bolt which cannot be disengaged from outside the premises.

It is a further object of the present invention to provide a lock bolt which is relatively simple in construction.

Another object of the present invention is to provide a lock bolt which prevents access from outside of the premises and which, when in its locked position, positively locks the bolt in place to prohibit sliding thereof.

Other objects and advantages of the invention will become apparent as the description proceeds.

BRIEF DESCRIPTION OF THE INVENTION In accordance with the present invention, there is provided a lock bolt comprising an L-shaped strike plate and an L-shaped bolt housing. The strike plate and bolt housing define apertures for enabling connection thereof to a respective door jamb and door, whereby when the door is closed, one arm of the bolt housings L will face and lie adjacent to one side of the strike plate. Means are connected to the bolt housing for carrying a bolt and permitting sliding movement of the bolt. A bolt is provided with knob means for enabling an operator to slide the bolt manually. The bolt housing has locking means cooperating with the knob means for retaining the knob means in a fixed, closed position when the bolt is in the bolt-receiving means.

In the illustrative embodiment of the invention, the knob means includes a knob fastened to a springloaded pin, with the spring acting to bias the pin toward the bolt housing. The locking means comprises an aperture defined by the bolt housing for receiving the spring-loaded pin.

In the illustrative embodiment, the bolt housing comprises a bolt plate for direct connection to the door and a retainer plate for connection to the bolt plate. The means for carrying the bolt is formed by bends in the bolt plate, which bends extend through an opening in the retainer plate. A bar couples the knob means with the bolt, and means are provided for fastening the bar to the bolt.

A more detailed explanation of the invention is found in the following description and claims, and is illustrated in the accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a perspective view of a lock bolt constructed in accordance with the principles of the present invention;

FIG. 2 is a cross-sectional view thereof, taken along the line 2-2 of FIG. 1; and

FIG. 3 is an enlarged, exploded view of the lock bolt of FIG. I.

DETAILED DESCRIPTION OF THE ILLUSTRATIVE EMBODIMENT Referring to FIGS. 1 and 3 in particular, there is shown therein a strike plate 12 having a generally L- shape, with one arm 14 of the L carrying bolt-receiving means 16 and defining apertures 18 therein for permitting screws 18 to fasten the strike plate to a door jamb. Bolt-receiving means 16 defines a slot 20 into which a bolt may be extended.

The other arm 22 of L-shaped strike plate 12 defines apertures 24 for permitting screws to fasten the strike plate to the portion of the door jamb which faces the end of the door.

A bolt housing 26 is provided, which bolt housing comprises a bolt plate 28 that is fastened directly to the door and a retainer plate 30 which overlies bolt plate 28. Bolt plate 28 defines apertures 32 and retainer plate 30 defines apertures 34, which apertures are aligned to permit screws 35 to fasten the retainer plate and the bolt plate to a door 36.

Bolt plate 28 comprises flat portions 38 which lie flush against the door 36 and bent portions 40 which receive bolts 42 and extend through openings 44 defined by retainer plate 30. Retainer plate 30 has a front portion 46 and a side portion 48 at right angles thereto, to give the bolt housing 26 a generally L-shape, with arm 48 of the retainer plate facing arm 22 of the strike plate and lying adjacent to it when the door 36 is closed.

Bolts 42 are moved manually via bar 50 which is fastened to the bolts 42 by means of pins 52 which extend through apertures 54 of bar 50, slots 56 defined by bent portion 40, and into openings 58 defined by bolts 42 where the pins may be fastened by means of a pressure fit, rivet connection, or otherwise.

Bar 50 is moved by means of spring-loaded pin 60 having a manually engageable knob 62. Pin 60 extends through an aperture 64 defined by bar 50 and is surrounded by a compression spring 66, as shown most clearly in FIG. 2. Pin 60 carries a retaining tab 68 which retains a portion of the pin within the chamber 70 (see FIG. 2) and places spring 66 and a retaining washer 72 in greater compression when the knob 62 is pulled.

Retaining plate 30 is provided with apertures 76 and 78 which are utilized to lock in place pin 60. For example, when bolts 42 are not extended into the strike plate, pin 60 may extend into aperture 78. In order to lock the bolts within the bolt-receiving means 16, knob 60 is pulled to release pin 50 from aperture 78, the knob 62, pin 60 and associated bar 50 are moved in the leftward direction (with respect to FIGS. 1 and 3) to place the bolts 42 into slot 20 of bolt-receiving means 16 and pin 60 will enter aperture 76 to lock the bolts in place.

It can be seen that arms 22 and 48 aid in preventing access from the outside of the premises and a positive locking action on the inside of the premises is achieved by means of pin 60 extending into aperture 76. It is to be understood, however, that although two bolts are shown in the illustrative embodiment, one bolt or more than two bolts may be used if desired. Thus, although an illustrative embodiment of the present invention has been shown and described, it is to be understood that various modifications and substitutions may be made by those skilled in the art without departing from the novel spirit and scope of the present invention.

What is claimed is:

1. A lock bolt which comprises: an L-shaped strike plate defining apertures for enabling connection to a door jamb and carrying means for receiving a bolt; an L-shaped bolt housing defining apertures for enabling connection of one arm of the bolt housings L to the inside of a door and the other arm of the bolt housings L to the end of the door facing the jamb, whereby when the door is closed said other arm of the L will face and lie adjacent to one side of the strike plate; means connected to said bolt housing for carrying a bolt and permitting sliding movement of said bolt; a bolt and knob means for enabling an operator to slide said bolt manually, said bolt housing having locking means cooperating with said knob means for retaining said knob means in a fixed, closed position when said bolt is in said boltreceiving means; said bolt housing comprising a bolt plate for direct connection to the door and a retainer plate for connection to said bolt plate, said means for carrying said bolt being formed by bends in said bolt plate which extend through an opening in said retainer plate; and a bar coupling said knob means with said bolt, and means fastening said bar to said bolt.

2. A lock bolt which comprises: an L-shaped strike plate defining apertures for enabling connection to a door jamb and carrying means for receiving a bolt; an L-shaped bolt housing defining apertures for enabling connection of one arm of the bolt housings L to the inside of a door and the other arm of the bolt housings L to the end of the door facing the jamb, whereby when the door is closed said other arm of the L will face and lie adjacent to one side of the strike plate; means connected to said bolt housing for carrying a bolt and permitting sliding movement of said bolt; a bolt and knob means for enabling an operator to slide said bolt manually, said bolt housing having locking means cooperating with said knob means for retaining said knob means in a fixed, closed position when said bolt is in said boltreceiving means; said knob means including a knob fastened to a spring-loaded pin, said spring acting to bias said pin toward said bolt housing; said locking means comprising an aperture defined by said bolt housing for receiving said spring-loaded pin; said bolt housing comprising a bolt plate for direct connection to the door and a retainer plate for connection to said bolt plate, said means for carrying said bolt being formed by bends in said bolt plate which extend through an opening in said retainer plate; and a bar coupling said knob means with said bolt, and means fastening said bar to said bolt.

when said pin is pulled out of the locking aperture. 

1. A lock bolt which comprises: an L-shaped strike plate defining apertures for enabling connection to a door jamb and carrying means for receiving a bolt; an L-shaped bolt housing defining apertures for enabling connection of one arm of the bolt housing''s L to the inside of a door and the other arm of the bolt housing''s L to the end of the door facing the jamb, whereby when the door is closed said other arm of the L will face and lie adjacent to one side of the strike plate; means connected to said bolt housing for carrying a bolt and permitting sliding movement of said bolt; a bolt and knob means for enabling an operator to slide said bolt manually, said bolt housing having locking means cooperating with said knob means for retaining said knob means in a fixed, closed position when said bolt is in said bolt-receiving means; said bolt housing comprising a bolt plate for direct connection to the door and a retainer plate for connection to said bolt plate, said means for carrying said bolt being formed by bends in said bolt plate which extend through an opening in said retainer plate; and a bar coupling said knob means with said bolt, and means fastening said bar to said bolt.
 2. A lock bolt which comprises: an L-shaped strike plate defining apertures for enabling connection to a door jamb and carrying means for receiving a bolt; an L-shaped bolt housing defining apertures for enabling connection of one arm of the bolt housing''s L to the inside of a door and the other arm of the bolt housing''s L to the end of the door facing the jamb, whereby when the door is closed said other arm of the L will face and lie adjacent to one side of the strike plate; means connected to said bolt housing for carrying a bolt and permitting sliding movement of said bolt; a bolt and knob means for enabling an operator to slide said bolt manually, said bolt housing having locking means cooperating with said knob means for retaining said knob means in a fixed, closed position when said bolt is in said bolt-receiving means; said knob means including a knob fastened to a spring-loaded pin, said spring acting to bias said pin toward said bolt housing; said locking means comprising an aperture defined by said bolt housing for receiving said spring-loaded pin; said bolt housing comprising a bolt plate for direct connection to the door and a retainer plate for connection to said bolt plate, said means for carrying said bolt being formed by bends in said bolt plate which extend through an opening in said retainer plate; and a bar coupling said knob means with said bolt, and means fastening said bar to said bolt.
 3. A lock bolt as described in claim 2, said bar defining an aperture through which said pin extends, with said knob being located on one side of said bar and said spring being located on the other side of said bar, and means connected to said pin for preventing said pin from disengaging said spring, said last-mentioned means also being operative to compress said spring when said pin is pulled out of the locking aperture. 